Duplicating and like printing machine



Sept. 18, 1923.

W. CHIPPERFIELD DUPLICATING AND LIKE PRINTING MACHINE Filed April 15.1921 5 Sheets-Sheet 2 Sept. 18, was. Lamas? W. CHIPPERFIELD DUPLICATINGAND LIKE PRINTING MACHINE Filed April 13 1921 3 Sheets-Sheet 5 avweutozW ig aM Q Md m MW @1 1; v wad/Mg Patented Sept. 18, 1923..

. FEE.

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DUPLICATING AND LIKE PRINTING- Application filed. April 18, 1921.

To all whom it may concern:

Be it known that I, War/ran Cmrrnn- FIELD, a subject of the King ofGreat Britain, residing at Kinkora, Great Nelmes,'

Hornchurch, Essex, England, have invented certain new and usefulImprovements in Duplicating and like Printing Machines ((for which Ihave filed an application in reat Britain January 19, 1920, No. 1647),

of which the following is a specification.

l6 roller and the printing cylinder is prevented 2 0 the throw-out levercauses contact between whenever a sheet of paper fails to be fed intothe machine. In previously constructed machines with which I am familiarthe arrangement has been such that movement of the impression roller andthe printing 0 linder whether a sheet of paper has been ed thereto ornot, and if no paper has been fed an imprint appears on the impressionroller.

This has necessitated either the removal of the roller for cleaning, orelse a quantity of paper has to be fed through to remove the imprint.With such machines, when the throw-out lever is in its inoperative or 3throw-out position the impression roller is still rotated by theprinting cylinder, but the roller is not in actual contact with theprinting surface, the arrangement being such that while contact betweenthe cylinder and impression roller is interrupted, such interruption isnot sufiicient to cause the gear wheels mounted on the cylinder androller respectively to be separated.

In accordance with my invention means are provided whereby movement ofthe throw-out lever into operative or throw-in position does not bringthe surface of. the impression roller quite into contact with theprinting surface on the cylinder. When a sheet of paper is fed into themachine mechanism is put into operatlon which causes the impressionroller to move into operative position, to grip the sheet of paperbetween the roller and'the cylinder when the paper arrives in printinposition and to effect the printing thereo Should no sheet of paper befed into the machine the mechanism referred to is not brought intooperation. I accomplish these results by means of a finger or fingerswhich are lifted when the sheet Serial No. 481,015.

passes into the machine. When the fingers are not lifted, the throw-outlever being moved into operative position, a knife edge on a levercontacts against a pawl, this causing the compression of a spring whichresults in holding the impression roller in a position out of contactwith the cylinder, in the preferred embodiment of my device. When,however, the fingers are lifted by the passage of a sheet of paper, theknife edge and projectionon the lever does not strike the pawl, whichhas been raised out of the path of the knife edge, the result being thatthe spring referred to is permitted to expand and to move the impressionroller, at the right moment, into operative position.

In order that a clearer understanding of my invention may be hadvattention is hereby directed to the accompanying drawings forming partof this application and illustrating one embodiment of my invention.

In the drawings, Fig. 1 represents a rear elevation of a duplicatingmachine or like printing machine containing my invention,

1g. 2 1s a transverse view showing the mcchanlsm of the invention ininoperative position, Fig. 3 is a'similar view, the throwout lever beingmoved into operative position, the mechanism being in operative positlonpreparatory to printing, Figure 4 represents a partial reverse view ofthe mechanism shown in Fig. 2, Figure 5 is a view similar to that shownin Fig. 4, representing the posit-ions of the parts when a sheet ofpaper fails to be presented between the impression roller and theprinting cylinder and Fig. 6

is a similar view showing the position of the parts during the printingoperation.

The printing cylinder 1 is mounted on a shaft 2 supported between theside standards 3 and has a spur gear t secured thereto. This gear is inconstant engagement with a spur pinion 5 mounted on the shaft 6whichcarries the impression roller 7.

Shaft 6 is supported centrally in links 8, the links being pivoted atone end to levers 9 which are secured to a rock-shaft 10 extendingbetween the side standards 3. Levers 9 have extensions 9' beyondrock-shaft 10, a shaft 11 being carried thereby. A bar 12 is secured onshaft 11 and secured to this bar is a plate 13 against which abuts aspring 14, the other end of the spring hearing against the end of an arm15 which is secured on rock-shaft 10.

The opposite or right hand ends of lever 8, ,as shown in Figs. 2 and 3,aresupported by. meansof rollers 16 thereon which rest on bearings 17 or18 which are'prov ded on the upper surface of members 19, which areadjustably mounted in the heads of milled thumb nuts 20 operable onscrews carried by the bar 12.

Rock-shaft 10 carries a lever 21 secured thereon at the outer side ofone of the side standards 3, and this lever is raised or depressed hy apivoted connection with a hand operated throw-out lever 22.

Secured on shaft .11 is a two-armed lever 23 one arm of which carries aroller-24 which is adapted to contact against the surface. of cam 25attached to or formed on one of the side walls of printing cylinder 1.The other arm 23' of the lever is provided with a knife edge orprojection 26. Supported between the side standards 3 is a guide 27 anda bracket 27 which has open-' 1n formed in the opposite end ortion ofthg same to receive a spindle28. lhi's spindle has secured thereon afinger or fingers 29 and further carries. an armi30" having ivotedthereon a swinging pawl 31 one surace of which is adapted to slidefreely against a tooth formed on an arm 32 mounted on a stud 33. Aspring 34 is secured at one end to a pin mounted on one of the sidestandards 3, the other end being fitted on the pin which constitutes thepivotal connection between one of the links 8 and arms 9, so as toconstantly tendto draw links 8 to the right, referrin to Figs. 2 and 3.

The operation of t e device is as follows. In the position of the artsshown in .Fig. 2 the machine is'in its inoperative position, thethrow-out lever 22 being down whereby the lever 21 is raised, rock-shaft11 having been swung downwardly about shaft 10 as a centre. Accordingly,the impression roller 7 has been lowered and moved away from theprinting cylinder 1 somewhat, and the roller 24 carried by arm 23 hasbeen moved away from the path of cam 25. The various arts have swungfreely with shaft 10 and accordingly spring 14'is not under compressionand therefore rollers 16 rest upon their upper supports 17 on members1.9. The movement of the impression roller away from the printingcylinder has been insuflicient to cause complete disengagementof'theteeth of pinion 5 with spur gear 4.

When the throw-out lever 22 is raised into its operative or throw-inposition shown in Fig. 3, shaft 10 is rotated thereby in acounter-clockwise direction, referring to Figs. 2'and 3, members 19carrying the right hand ends of links 8 are raised and the 1mpressionroller tends to move toward the rinting cylinder. Complete enga ement,

owever, is prevented either by ro ler 24 striking against cam 25 or byknife edge 26 abutting against the front edge of the pawl 81 as shown inFig. 5. If no sheet of paper is fed into the machine, and cam 25 is notin the path of roller 24, knife edge 26 will abut against awl 31 asstated which interrupts 'thecomp ete movement of lever 23 against thecompression of spring 14 between 1 the plate 13 and arm 15. Thisincomplete movement of lever 23 and member 19 results'in rollers 16dropping down on to the lower roller supports 18, the consequentlowering of the impression rollerpreventing the latter from contactinwith the printing cylinder. .Were comp ete movement permitted, member 19would have moved surface 17 under rollers 16 and would have raised theimpression roller into con-- tact with the cylinder. 1

When, however, a' sheet of paper is fed through the feed'rollers X thesheet is'deflected upwardl between the guide 27'. and

bracket 27 an strikes against the under surfaces orsurface ofthefingers. or finger 29. This raises finger 29 somewhat, sufiiciently torook-spindle 28 and to lift arm 30 and pawl 31v to an" extent suflicientto' move pawl 31 out of the path of knife edge 26 so that the latterwillnotstrike the pawl,'.

is fed into the machine. This engagement of the roller against the camprevents the complete movement of arm 23 and parts connected thereto andaccordingly compaper are fed presses spring 14. The result of incompletemovement of lever 23 and member 19 combined with complete movement oflinks 8 to the left is to move rollers 16 from their upper supports. 17to their lower supports 18, or to maintain the rollers in their lowerpositions if they were already in such lower positions. The finger 29 israised by the advancing sheet of paper, so that knife edge 26 does notstrike against pawl 31. Roller 24 will then ride off of cam 25 as theforward edge of the paper reaches the printing position between theimpression roller and the cylinder. When roller 24 rides oil of cam 25spring 14.is thereby allowedto expand whereby members 19 are moved tothe left and rollers 16 are forced upwardly on to the upper bearings 17,so that the teeth of pinion 5 and gear'4 come into full engagement andimpression roller 7 contacts against the surface of the printingcylinder 1, or rather, against the outer surface of the paper sheetwhich is thereu n firmly pressed against the cylinder, warded betweenthe impression roller and the cylinder, and imprinted upon.

naeaaav not pass through the feeding rollers, the pawl 31 will not belifted and when the roller 24 of lever 23 rides ofi the cam 25 the twoarmed lever is arrested by the knife edge 26 striking against the faceof pawl 31 as shown in Fig. 5, and spring 14 remains compressed and theimpression roller is lowered out of contact with, or is prevented from.coming into contact with the printing cylinder in the manner previouslydescribed.

When the printing is completed a downwardmovement'of throw-out lever 22causes the impression roller to be moved into its farthest outwardposition, such action being assisted by spring 34 which is under tensionduring the printing operation.

The milled headed nuts regulate the, tension of the impression rollerwith the printing cylinder.

It should be understood that my invention is not limited to the detailsof construction described but is as broad as is indicated by theaccompanying claims.

What I claim is:

1. In a duplicating machine,'the combination of a printing cylinder, animpression roller, a throw-out lever, means operable thereby for movingsaid roller towards and away from said cylinder, means for preventingcontact between said roller and cylinder, and means operated by thepassage of a paper sheet into position to be printed upon, when saidlever is in throw-in position, for overcoming said preventing means.

2. In a duplicating machine, the combination of a printing cylinder,paper feed means, an impression roller, a throw-out lever, a stopmember, an arm adapted to en gage said stop member when said lever israised, supporting means for said roller such that raising said levermoves said roller toward said cylinder, spring mechanism coacting withsaid supporting means for holding said roller away from. said cylinderwhen said arm engages said stop member, and means for moving said stopmember out of the path of said arm when a paper sheet passes throughsaid feed means.

3. In a duplicating machine, the combina\ tion of a printing cylinder,having ac-am thereon, paper feed means, an impression roller, aroller-bearing arm, a throw-out lever, supporting means for saidimpression roller and arms such that movement of said lever in onedirection or the other moves said rollers towards or away from saidcylinder, spring mechanism connected to said impression roller forholding said roller away from said cylinder irrespective of movement ofsaid lever when the roller on said. arm engages said cam, and forholding said roller away from said cylinder when the roller on said armmoves away from said cam into contact with said cylinder, and no paperis fed through said paper feed means.

4. In a duplicating machine, the combination of a printing cylinder, animpression roller, links supporting said roller, arms pivotally carryingone end of each of said links, means supporting the opposite end of saidlinks, and means for raising said last named means when a paper sheet isfed into the machine, to cause coaction between said roller, cylinder,and sheet, and for preventing the raising of said means when no papersheet is fed into the machine.

5. In'a duplicating machine, the combination of a printing cylinder, animpression roller, links supporting said roller, pivoted arms to whichone end of each of said links is pivoted, supports for the opposite endsof said links, having higher and lower surfaces at greater and lessdistances from said arms, spring means governing the angular position ofsaid links, paper feed means, and means for acting on said sprin meanswhen no paper is fed through said eed means, to position said oppositeends of said links on said lower supporting surfaces, away from saidcylinder. 7

6. In a duplicating machine, the combination of a printing cylinder, animpression roller, links supporting said roller, pivoted arms to whichone end of each of said links is pivoted, supports for the opposite endsof said links, having higher and lower surfaces at greater and lessdistances from said arms, a throw-out lever, paper feed means, meanstending to move said opposite ends of said links on to said highersupporting surfaces when said lever is moved into throw-in position,means preventing such movement when no paper is fed through said feedmeans, and means operated by passage of paper through said feed means torender said preventing means inoperative.

This specification signed and witnessed this 18th day of March, 1921.

WALTER GHIPPERFIELD.

